One of the best dog pad tougheners on the market.  Artisen made in small batches and without staining dyes, this pad toughener really does the trick.  If your dog's feet need to heal up fast or they need toughened up, this stuff work like a charm.  It has been used for many years by serious sheepdog trialers.  

Handhills Tuff N Up toughens and protects your dogs feet when sheepdog trialing, or hunting on hard ground, rocks, or ice. It is the perfect dog first aid product for conditioning your dog's feet pre-season. This pad conditioner helps heal injured pads fast, and also works as an antiseptic for scrapes or minor cuts.